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Is there a command line tool for Windows to extract audio aac from mp4 ?

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5 Answers 5

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Yup Neal is right , FFmpeg can do it

Here is a list of commands that might come useful for you

http://www.catswhocode.com/blog/19-ffmpeg-commands-for-all-needs

Go here for instructions

http://www.wikihow.com/Convert-a-Flash-Video-File-%28.flv%29-to-MP4-with-FFMpeg

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mp4box can also do this.

To demux/extract aac from mp4 (assuming audio is the 2nd track):

mp4box -raw 2 video.mp4

This will automatically create output file "video_track2.aac"

If you wanted control over the output filename, you would do

mp4box -raw 2 video.mp4 -out audio.aac

If you wanted to remux back into mp4 container (i.e. for iTunes) you could do:

mp4box -single 2 video.mp4 -out audio.m4a

note: gpac 0.5.0 has a bug that forces output filename to always end in .mp4, so if you wanted to use above command line you would need gpac 0.5.1

You could then put this in a batch script to operate over all the files in a directory:

for %%f in ("*.mp4") do (

mp4box -single 2 "%%f" -out "%%~nf.m4a"

)

(batch script inspired by videohelp and stackoverflow)

Download links:

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I think that FFmpeg should be able to do it, there are probably Windows binaries floating about the internet, or you could build your own.

Edit: Here's some locations of Windows downloads.

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Super can do it also.

SUPER © "The Player" surpasses any known player by supporting just any Multimedia file format. SUPER © plays files that cannot be played with WMP or even other libavcodec-based players like MPC and VLC. SUPER © also plays and saves Internet Media Streams of different protocols ( mms:// rtsp:// http://)

SUPER © "The Encoder" is the fastest and simplest tool to encode full length movies to any other format without any time or function limitation.

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Here’s the actual commands to use since all the provided links don’t actually give them, and anyway: links rot and die so should always be replaced with actual answers on stackexchange.

avconv -i input.mp4 -vn -c:a copy output.m4a
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